Four days late

Millie

Hello, I need some help! I had spotting four days ago that was dark brown and only when I wiped. That continued for two days and eventually turned faintly light brown. Now for two days I’ve had nothing. No sign of a period at all and I was due for my period four days ago! My breasts are really sore and I’m nauseated off and on but sometimes I can get the before my cycle as well....I tested negative this morning.. Any ideas?? I just want to start my period and get on to trying next month or finally see a positive 😭😫